How to build currency conversion in Bubble

The simplest, reliable way to build currency conversion in Bubble is to call a real currency‑rate API (like Exchangerate‑API or Fixer) through Bubble’s API Connector, store/use the returned conversion rate, and multiply the amount by that rate directly in your expressions. Bubble does not provide built‑in currency conversion, so an external API is required.

What You Actually Do in Bubble

You connect to a currency API, request the rate you need (for example USD → EUR), Bubble receives a JSON response with the rate, and you use that rate in your workflows. You can run this in a regular workflow (when user selects currencies) or in a backend workflow if you need to save rates automatically.

• API Connector: Bubble’s built‑in plugin for making external API calls.
• API Call: A request Bubble sends to the provider; the response contains the conversion rate.
• Rate: A number returned by the API, for example 0.92 meaning 1 USD = 0.92 EUR.

How to Set It Up Step‑by‑Step

• Create a free account on a currency API (example: exchangerate-api.com) and copy your API key.
• Open Plugins → Add Plugin → API Connector.
• Create a new API and add a call. Set it to GET and use the provider’s real endpoint.

// Example Exchangerate-API call configuration
https://v6.exchangerate-api.com/v6/YOUR_API_KEY/latest/USD

• Initialize the call. In Bubble you will now see parsed fields like conversion\_rates.EUR.
• Use the rate directly in an expression: Amount \* API’s conversion rate.

Using It in Bubble Workflows

In any workflow, add an action: Plugins → Your API Call. The response becomes available inside the workflow as “Result of step X”. You can then store the rate in the database (if you want to reuse it) or instantly calculate:

// Bubble expression example
Input Amount's value * Get Rates's conversion_rates.EUR

This works in elements, custom states, backend workflows, or calculations before creating things in the database.